Custom Chips: Alice

Alice is responsible for controlling around 25
system DMA channels and addressing Chip RAM. Infact, Chip Memory is so
called because it's addressable by the system's custom chips, unlike
Fast Memory. Alice also cotains an integrated Copper (co-processor)
which controls aspects of the Amiga's display such as draggable
screens, and the infamous "copper scrolls". The Amiga's blitter is also
located in the Agnus chip and is responsible for moving rectangular
areas of memory efficiently as possible. This may not sound
particularly spectacular but the blitter is up to twice as fast as the
processor at moving blocks of memory and is capable of doing it
asynchronously with the processor, meaning the processor is totally
free for other operations. The blitter is particularly useful for
graphics operations. Alice is found in the AGA chipset, and is
equivalent to Agnus found in the OCS and ECS chipsets.